Large Transverse Momentum Direct Photon, Neutral Pion and Meson Production with a Carbon Target

Measurements of direct photon, (pi)('0) and (eta) inclusive production cross sections have been made in a 200 GeV/c positive beam at FNAL. Data are presented for incident P and (pi)('+) beams with a carbon target in the p(,T) range 2.05 to 5.00 GeV/c and the CM rapidity interval of -0.8 to 0.2. A liquid argon total absorption calorimeter was utilized as a photon detector. The observation of a small but significant yield of direct photons is compatible with the predictions of Quantum Chromodynamics.